Adobe AIR app is hardly clickable at the upper right corner only on iOS

I've build Adobe AIR Flex app that is working on Android in Google Play and on iOS in Apple Store. But on iPhone 5 - the upper right corner buttons are very very hard to click.

The flex application is done well - there is nothing on top of the buttons, and it works perfectly on Android, but on iOS the buttons kind of work after 5-10 times of trying to click them.

Can it be because of the top bar that iPhone can drag down in the native screen ?

Here is my monopoly app on iOS so you can see it for yourself. And here is the monopoly in Google Play - working without problems.

Thanks!